OSX 10.5.8 not answering AFP TCP Syn requests with SynAck

[jballiet]

I have opened port 548 on my firewall and NAT back to an internal IP address. The problem is when the TCP requests is answered by my Xserver interface, it does not reply with a syn-ack, therefore no handshake occurs. The AFP service is on….

PORT STATE SERVICE
22/tcp open ssh
25/tcp open smtp
80/tcp open http
88/tcp open kerberos-sec
139/tcp open netbios-ssn
311/tcp open asip-webadmin
445/tcp open microsoft-ds
497/tcp open dantz
548/tcp open afpovertcp
625/tcp open unknown
3306/tcp open mysql

The TCP dump looks like…

2 3.289987 67.133.35.X 192.168.149.2 TCP 50412 > afpovertcp [SYN] Seq=0 Win=65535 Len=0 MSS=1400 WS=2 TSV=1924521157 TSER=0
5 5.840993 67.133.35.X 192.168.149.2 TCP 50412 > afpovertcp [SYN] Seq=0 Win=65535 Len=0 MSS=1400 WS=2 TSV=1924521162 TSER=0
8 8.841269 67.133.35.X 192.168.149.2 TCP 50412 > afpovertcp [SYN] Seq=0 Win=65535 Len=0 MSS=1400 WS=2 TSV=1924521168 TSER=0
10 11.841540 67.133.35.X 192.168.149.2 TCP 50412 > afpovertcp [SYN] Seq=0 Win=65535 Len=0 MSS=1400
14 14.842060 67.133.35.X 192.168.149.2 TCP 50412 > afpovertcp [SYN] Seq=0 Win=65535 Len=0 MSS=1400
19 17.842338 67.133.35.X 192.168.149.2 TCP 50412 > afpovertcp [SYN] Seq=0 Win=65535 Len=0 MSS=1400
23 23.843144 67.133.35.X 192.168.149.2 TCP 50412 > afpovertcp [SYN] Seq=0 Win=65535 Len=0 MSS=1400

Any ideas?

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